diff --git a/themes/pmahomme/scss/_jqplot.scss b/themes/pmahomme/scss/_jqplot.scss
index 9d69847969..cda841aaab 100644
--- a/themes/pmahomme/scss/_jqplot.scss
+++ b/themes/pmahomme/scss/_jqplot.scss
@@ -223,9 +223,9 @@ table.jqplot-cursor-tooltip {
 .jqplot-highlighter-tooltip,
 .jqplot-canvasOverlay-tooltip {
   border: 1px solid #ccc;
-  font-size: 0.75em;
+  font-size: 1em;
   white-space: nowrap;
-  background: rgba(208, 208, 208, 0.5);
+  background: rgba(208, 208, 208, 0.8);
   padding: 1px;
 }